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- Chapter 1- Rational and Irrational Numbers
- Chapter 2- Compound Interest [Without Using Formula
- Chapter 3- Compound Interest [Using Formula
- Chapter 4- Expansions
- Chapter 5- Factorisation
- Chapter 6- Simultaneous Equations
- Chapter 7- Indices [exponents]
- Chapter 8- Logarithms
- Chapter 9- Triangles [Congruency in Triangles]
- Chapter 10- Isosceles Triangle
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- Chapter 13- Pythagoras Theorem
- Chapter 14- Rectilinear Figures
- Chapter 15- Construction of Polygons
- Chapter 16- Area Theorems
- Chapter 17- Circles
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- Chapter 19- Mean and Median
- Chapter 20- Area and Perimeter of Plane Figures
- Chapter 21- Solids
- Chapter 22- Trigonometrical Ratios
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- Chapter 24- Solution Of Right Triangles
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- Chapter 26- Co-ordinate Geometry
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Selina Solutions Class 9 Mathematics Solutions for Exercise 1(D) in Chapter 1 - Chapter 1- Rational and Irrational Numbers
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Show that x is rational if:
(i) x²=16
(ii) x2=0.0004
(iii) x2=
1\frac{7}{9}
Answer:
(i) x²=16
⇒ 𝑥 = √16=4, which is rational.
(ii) x² =0.0004
⇒ 𝑥 = √0.0004=0.02, which is rational.
(iii) x²=1\frac{7}{9}
⇒ 𝑥 = \sqrt{1 \frac{7}{9}}=\sqrt{\frac{16}{9}}=\frac{4}{3}, \text { which is rational. }
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